diff --git a/firmware/common/hackrf_core.c b/firmware/common/hackrf_core.c
index b94fc967..f2abd656 100644
--- a/firmware/common/hackrf_core.c
+++ b/firmware/common/hackrf_core.c
@@ -252,7 +252,7 @@ void cpu_clock_init(void)
             | CGU_PLL1_CTRL_PSEL(0)
             | CGU_PLL1_CTRL_NSEL(0)
 			| CGU_PLL1_CTRL_MSEL(16)
-			| CGU_PLL1_CTRL_FBSEL;
+			| CGU_PLL1_CTRL_DIRECT;
 
 	/* wait until stable */
 	while (!(CGU_PLL1_STAT & CGU_PLL1_STAT_LOCK));